The Weller River (Stream) is a tributary left bank of the Blanche River (St-Casimir) whose confluence is found east of the municipality of Saint-Ubalde, in the Portneuf Regional County Municipality, in the administrative region of Capitale-Nationale, in the province of Quebec in Canada.

Forestry is the main economic activity in the upper part of this hydrographic slope; agriculture, in the lower part.

[1] The Weller River rises at Lac Carillon (length: 3.3 kilometres (2.1 mi); altitude: 219 metres (719 ft)) which straddles the boundary of the municipalities of Saint-Ubalde (Quebec) and Notre-Dame-de-Montauban.

The term "Weller" is a surname of German origin.

The toponym "Rivière Weller" was registered with the Place names bank of the Commission de toponymie du Québec on May 5, 1981.